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(y-1)2=9
We move all terms to the left:
(y-1)2-(9)=0
We multiply parentheses
2y-2-9=0
We add all the numbers together, and all the variables
2y-11=0
We move all terms containing y to the left, all other terms to the right
2y=11
y=11/2
y=5+1/2
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